/* Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <hurd/sigpreempt.h> #include <hurd/signal.h> #include <assert.h> void hurd_preempt_signals (struct hurd_signal_preemptor *preemptor) { __mutex_lock (&_hurd_siglock); preemptor->next = _hurdsig_preemptors; _hurdsig_preemptors = preemptor; _hurdsig_preempted_set |= preemptor->signals; __mutex_unlock (&_hurd_siglock); } void hurd_unpreempt_signals (struct hurd_signal_preemptor *preemptor) { struct hurd_signal_preemptor **p; sigset_t preempted = 0; __mutex_lock (&_hurd_siglock); p = &_hurdsig_preemptors; while (*p) if (*p == preemptor) { /* Found it; take it off the chain. */ *p = (*p)->next; if ((preemptor->signals & preempted) != preemptor->signals) { /* This might have been the only preemptor for some of those signals, so we must collect the full mask from the others. */ struct hurd_signal_preemptor *pp; for (pp = *p; pp; pp = pp->next) preempted |= pp->signals; _hurdsig_preempted_set = preempted; } __mutex_unlock (&_hurd_siglock); return; } else { preempted |= (*p)->signals; p = &(*p)->next; } __mutex_unlock (&_hurd_siglock); /* Avoid deadlock during death rattle. */ assert (! "removing absent preemptor"); }